JPH07213346A - Production of tooth brush sharpened at hair tip to tapered shape - Google Patents

Abstract

PURPOSE:To obtain a tooth brush sharpened at hair tips to a tapered shape by immersing the tooth brush into a solvent liquid down to prescribed depth from the pruning plane of fibers and rubbing these fibers from inside of the liquid surface. CONSTITUTION:The brush part of the tooth brush formed by implanting the fibers made of '6, 12 Nylon (R)' to a polypropylene handle is immersed into a methanol. The methanol penetrates down to the inside of flocking holes, is filled therein and is held in the fiber bundles by capillarity. Next, the brush part is immersed into a formic acid soln. down to the prescribed depth from the pruning surface 5 and is rubbed for 15 minutes by a rotary brush 3 from below. The methanol is substd. for the formic acid to dissolve the fibers and partial dissolution begins. The parts to be strongly rubbed are subjected to replacement of the solvent at all times and are chipped off in the stage when swelling progresses and, therefore, the dissolution rate in these parts is higher than in the other parts and tapers are formed. The formic acid to dissolve the fibers does not rise upper than the liquid surface as far as the methanol exists. The entire part of the brush part is again immersed into the methanol liquid and is rubbed. The formic acid is washed away before arriving at the flocking holes of the holes. The booth brush sharpened at the hair tips to the tapered shape is thus obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush for brushing teeth, and to a toothbrush with sharply pointed bristles, which is capable of removing foreign matter accumulated in an extremely narrow space between teeth as well as between teeth and gums. About toothbrush that can be removed.

[0002]

2. Description of the Related Art Conventionally, one kind of toothbrush of this kind has been commercially available, but the material of the fibers constituting the brush is only polyester, and the bristle length is as long as 12 mm or more.

[0003]

The fact that the bristle length is as long as 12 mm or more depends on the size of the oral cavity of each person who uses the toothbrush, but normally 10 mm is standard,
If it is longer than this, movement in the oral cavity tends to be restricted. Further, when the material of the hair is polyester, it is desirable that the polyester is a fiber material having a low hydrophilicity and a wide range of affinity between the material and the dentifrice.

Since the toothbrush is used in the oral cavity, there is a problem that a substance harmful to the human body must not remain in the toothbrush.

There are many types of solvents that dissolve the material of hair, but most of them are not completely harmless to the human body, and a mechanical grinding means is used without using chemical dissolving power. Even if you try to make the tip tapered, the bristles are made of synthetic resin, so the response to cutting or grinding loads will appear in the form of plastic deformation or distortion, and form a smooth surface to make the tip sharp. Has a difficult problem.

Further, when a solvent is used, in the case where the solvent has a high boiling point which cannot be easily removed, etc., when the solvent has penetrated into the bristles of the bristles of the brush, it is easy. Has a problem that the solvent cannot be removed by washing.

[0007]

The present invention has been made to solve the above problems, and the present invention is summarized as follows.

1) After immersing the brush portion of the toothbrush in an inert solvent which does not dissolve the fibers and the material of the handle and is volatile at room temperature, the pruning surface of the fibers is immersed in a solvent that dissolves the fibers. To a predetermined depth from the liquid surface of the solvent, rubbing the fibers from the liquid surface, sharpening in a taper toward the pruning surface of the fibers, then again in the inert solvent The entire brush portion is dipped and the fibers are rubbed and washed, and then hot air drying and / or dry heating by dryness is performed,

2) The means for rubbing in the solvent solution for dissolving the fibers and the solvent solution for washing is a rotating brush or a rotating drum.

[0010]

First, when the entire brush portion of the toothbrush is immersed in an inert solvent, the solvent permeates and fills the hair-filling holes, and the fiber bundle is held by the capillary phenomenon. Next, when only the portion to be tapered is immersed in a solvent that dissolves the fiber, the inert solvent of the portion is replaced with the solvent that dissolves the fiber, and the dissolution of the portion begins. In this case, since the portion to be tapered is a portion that does not reach the handle from the pruning surface of the brush toward the handle, it is immersed in the solvent liquid surface with the pruning surface facing downward. As far as the above-mentioned inert solvent is present, the liquid for dissolving the fibers does not flow upward.

When the fibers are rubbed in this state, the surface of the fibers is completely wetted by the solvent that dissolves the fibers and progresses from swelling to dissolution.

[0012] Here, since the solvent is always replaced at the portion where the sliding contact is strong and the solvent is removed at the stage where the swelling progresses, the dissolving speed becomes faster than other portions, and a taper is formed.

In this case, since the exchange of the inert solvent and the solvent for dissolving the fibers is performed only by the static diffusion and the generated convection, the fibers of the fibers located above the liquid surface remain at about 2 to 3 mm. It will be washed away while it does not reach the pores. In this cleaning step, it is also effective to apply ultrasonic vibration to the cleaning liquid.

After that, the inert solvent is completely removed by heating and drying the toothbrush with hot air.

The above is mainly the operation and effect of the manufacturing method of the toothbrush. However, in the toothbrush, since the tips of the fibers that have been transplanted are sharp and sharp, the teeth and gums and the teeth are extremely narrow. The brush also reaches, and has a function of removing foreign matter existing there by acting, and further, the pruned surface of the above-mentioned flocked fibers is not flat, for example, it is uneven like saw teeth. , When the manufacturing method is applied when it is inclined or the like, only the portion having a long hair length is sharpened, and the short portion remains in the original state, so that the short portion is not sharpened. It is also possible to express a complex function having a function.

[0016]

EXAMPLE A brush of a toothbrush in which fibers of 6.12 nylon (Tynex made by Dupont) are planted in a polypropylene handle is dipped in methanol as shown in FIG. 1, and then, as shown in FIG. After being dipped in the formic acid solution to a predetermined depth and rubbed from below with the rotating brush 3 for 15 minutes, the entire brush portion was again dipped in the methanol solution and rubbed to sharpen the tips of the bristles. Got a toothbrush.
This product was dried for 1 hour in a vacuum heating dryer set at 100 ° C., taken out, extracted with water, and subjected to gas chromatography analysis. No peaks corresponding to formic acid or methanol were observed.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a rotary brush is rubbing the surface.

FIG. 2 is a side view showing a state where cleaning is performed with a rotating brush.

[Explanation of symbols]

 1: Handle 2: Fiber 3: Rotating brush 4: Liquid level 5: Pruning surface

Claims (3)

[Claims] 1. An inert solvent volatile at room temperature which does not dissolve the material of the fiber or handle in the brush portion of a toothbrush in which fibers are planted and whose tip surfaces are aligned and pruned to a predetermined bristle length. After immersing in the fiber, the fiber is immersed in a solvent that dissolves the fiber from the pruning surface to a predetermined depth below the liquid surface of the solvent, and the fiber is rubbed from the liquid surface to prun the fiber. After sharpening in a taper shape toward the surface, the entire brush part is immersed again in the inert solvent and the fibers are rubbed to be washed, and then hot air drying and / or dry drying with dry air is performed. A method for producing a toothbrush with sharpened bristles in a tapered shape. 2. The method for producing a toothbrush with sharply tapered hair tips according to claim 1, wherein the outer periphery of the toothbrush is rubbed with a rotating brush in contact with the liquid surface. 3. The method for producing a toothbrush with sharpened bristle tips according to claim 1, wherein spiral irregularities are formed on the outer periphery and the outer periphery is rubbed with a rotating drum in contact with the liquid surface.